The International Atomic Energy Agency issued a critical report Tuesday saying that it has "serious concerns" about Iran's nuclear program and has obtained "credible" information that the Islamic republic may be developing nuclear weapons.
The IAEA report, the most detailed to date on the Iranian program's military scope, found no evidence that Iran has made a strategic decision to actually build a bomb. But its nuclear program is more ambitious and structured, and more progress has been made than previously known.
"The agency has serious concerns regarding possible military dimensions to Iran's nuclear program," the report said. "After assessing carefully and critically the extensive information available to it, the agency finds the information to be, overall, credible. The information indicates that Iran has carried out activities relevant to the development of a nuclear explosive device."
U.S. State Department spokeswoman Victoria Nuland said the report had just arrived and refrained from commenting on details at an afternoon briefing. But a senior U.S. official called the report "a big deal."
Iranian President Mahmoud Ahmadinejad called the report a sham.
"The Americans have fabricated a stack of papers and he keeps speaking about them," he said on state-run Press TV.